Fluidic pulse counter

ABSTRACT

In a bistable pure fluidic element there are provided a first circulation passage having an input pulse source in communication with two control nozzles, a second circulation passage connecting said input pulse source with one point of each of two output flow passages and a third circulation passage formed in the proximity of a main jet dividing or diverting edge so as to branch at leat one portion of a main jet of the element. Associated circuits are also disclosed.

United States Patent 1 1 1 1 3,719,195 Matsuda 1 1 March 6, 1973 15 1FLUIDIC PULSE COUNTER 3,584,635 6/1971 Warren ..l37/8l.5 [75] Inventor:Yasumasa Matsuda, Hitachi, Japan 32333 323;} [73] Assignee: Hitachi,Ltd., Tokyo, Japan 3,614,964 10/1971 Chen ..l37/81.5 3,640,300 2/1972Boothe et a1. ....137/81.5 Flledi J y 27, 1971 3,667,489 6/1972Blaiklock etal... ....137/81.5 [211 pp No: 166,472 3,667,492 6/1972 D1Cam1llo ..l37/81.5

30 Forei n A lication Priorit Data Primary Examine' samuel Scott 1 g W YAttorney-Craig, Antonelli & 11111 July 30, 1970 Japan ..45/66077ABSTRACT Dec. 28, 1970 Japan............... ....45/l2()139 In a bistablepure fluldic element there are provided a May 21, 1971 Japan ..46/34036first circulation passage having an input pulse Source in communicationwith two control nozzles, a second [52] [1.8. CI. 137/811, 235/201circulation passage connecting i input pulse Source [51] Int.C1. ..Fl5c1/12 with one point of each of two output flow passages [58] Fleld ofSearch and a third circulation p g formed in the p i I ty of a main jetdividing or diverting edge so as to [56] References cued branch at leatone portion of a main jet of the ele- UNITED STATES PATENTS ment.Associated circuits are also disclosed.

3,527,240 9 1970 Metzger ..137/s1.5 12 Claims, 41 Drawing Figures3,528,442 9/1970 Campagnudo l 37/81.5 3,547,137 12/1970 Chadwick..137/81.5 X 3,581,757 6/1971 Pavlin et a1 ..l37/81.5

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FIG. 37

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ATTORNEYS FLUIDIC PULSE COUNTER The present invention relates to afluidic pulse counters utilizing pure fluidic elements.

There have been proposed various fluidic pulse counters utilizing purefluidic elements, but they are still unsatisfactory in operation anddifficult to design and manufacture. As a principle they may countpulses but they are based upon a more or less undependable principle.Time lags are developed in the process of switching the flip-flops forswitching the output flows in the last stage because of the fluid typeso that the erratic operations tend to occur. As the result the highestfrequency at which the fluidic pulse counter can count is limited.

PRIOR ART The typical prior art fluidic pulse counter illustrated inFIG. 1 is based upon the simplest principle. In a flipflop element 6 forswitching the output flow encircled by the dotted lines in FIG. 1,control nozzles 3 and 3 are connected to each other with passages and 5'and an input pulse port 4 is opened at the midpoint of these passages 5and 5'. Working fluid emerges from a main jet nozzle 1 and is divertedto flow through either of the right or left output flow passages 2 or2'. The output flow 2 or 2 remains to flow through the right or leftoutput flow passage in a stable manner unless the signal flow emergesout of the control nozzle 3 or 3' in the flip-flop element 6. When theoutput flow 2 passages through the right output flow passage 2 as shownin FIG. 1, the negative pressure flow is formed in the control nozzle 3due to the suction of the output flow 2 so that the fluid circulatesthrough the circulation passage 3"5 =53 as indicated by the arrows.However, this circulating flow is not sufficient enough to switch theoutput flow 2 to flow through the left output flow passage 2'. When theinput pulse is applied through the input pulse port 4, it is guided bythe circulating flow and flows into the passage 5 as the signal flow 4.When the signal flow 4 is discharged from the control nozzle 3, theoutput flow is switched. That is working fluid now flows through theleft output passage 2' as the output flow 2, and the output flow 2'remains flowing through the passage 2 even after the input pulse orsignal flow 4 disappears while the circulating flow flows in thedirection opposite to the direction indicated by the arrows. When thenext input pulse arrives at the input pulse port 4, the output flow 2'is switched to flow through the right output flow passage 2 in a similarmanner described above. That is, the flip-flop is returned to itsinitial state. Whenever the input pulses arrive at the input pulse port4, above output flow switching operations are repeated, whereby theinput pulses are counted in a binary mode.

However the prior art fluidic pulse counter of the type shown in FIG. 1has many problems when used in practice. The first problem is that thematching range of the flip-flop element 6 for connection with an inputpulse diverting element 6' is narrow so that the erratic operations tendto occur even when the pulse counter has a small manufacture tolerance,the design becomes difficult and a wide product variation tends to occurbecause the input pulse flow is diverted only by the control flow of theflip-flop element.

A first object of the present invention is therefore to provide animproved fluidic pulse counter which may overcome the problemsencountered in the prior art pulse counters and whose operation isreliable and dependable with higher reproducibility.

. A second object of the present invention is to provide an improvedfluidic pulse counter whose function is exceedingly improved over theprior art pulse counters.

When pure fluidic pulse counters are connected in series in fan-out l ormore or connected to other fluidic elements or devices and when thefluidic element or device connected as the load of the fluidic pulsecounter has a minimum allowable input level, the fluidic element ordevice connected cannot operate at all or erratic operation occursunless the pressure or flow rate of the output of the pulse counter.

A third object of the present invention is therefore to increasematching range between a pure fluidic pulse counter and a fluidicelement or device (which is not limited to the pure fluidic type) to beconnected thereto in the next stage.

A fourth object of the present invention is to provide a pure fluidicpulse counter whose function is stable without being disturbed by theexternal disturbance such as the load variation.

A fifth object of the present invention is to provide a pure fluidicbuffer amplification method so that the output amplification especiallyat a high frequency may be made in a positive manner and the functionwill not be lowered by the load variation.

A sixth object of the present invention is to provide a pure fluidicbuffer amplification method of the type described above in whichmatching adjustment between a fluidic element or device and a monostableelement to be connected in the next stage may be facilitated especiallyat high frequencies.

A seventh object of the present invention is to provide a set and resetmethod so that a pure fluidic pulse counter may set and reset positivelyregardless of the presence or absence of the input signal flow and theminimum pressure of the set and reset signals are independent upon thepresence and absence of the input signal flow.

Briefly stated, the present invention provides a pure fluidic pulsecounter characterized in that a bistable pure fluidic element includinga main jet source, control ports and output flow passages is providedwith a first circulation passage having an input pulse source incommunication with said two control ports, a second circulation passageconnecting said input pulse source with one point of each of said twooutput flow passages, and a third circulation passage formed in theproximity of a main jet dividing or diverting edge of said'element so asto pass therethrough at least one portion of the main jet, whereby thecirculating flow may be positively formed either or both of said firstand second circulation passages. The counting ability and reliability ofthe pure fluidic pulse counter may be remarkably im proved over theprior art counters.

The present invention further provides various auxiliary circuits forfurther improving the pulse countingcapability and reliability of thepure fluidic pulse counter of the type described above.

The present invention will become more apparent from the folowingdescription of the preferred embodiments thereof taken in conjunctionwith the accompanying drawings.

FIG. 1 is a diagrammatic view of the prior art pure fluidic pulsecounter;

FIG. 2 is a diagrammatic view of a pure fluidic pulse counter inaccordance with the present invention for accomplishing the first objectthereof;

FIG. 3 is a graph of the data obtained by the experiments forexplanation of the effect of the pure fluidic pulse counter shown inFIG. 2;

FIG. 4 is a diagrammatic view for explanation of the principle offorming the circulating flow in the fluidic pulse counter shown in FIG.2;

FIG. 5 is a diagrammatic view for explanation how the circulating fiowis formed in order to accomplish the second object of the presentinvention;

FIG. 6 is a view illustrating the fundamental fluid passageconfiguration of the present invention when it is applied to a'fluidicpulse counter;

FIG. 7 is a diagrammatic view of a pure fluidic pulse counter foraccomplishing the second object of the present invention;

FIGS. 8 and 9 are graphs of the data obtained by the experiments of thepure fluidic pulse counter shown in FIG. 7;

FIG. 10 is a view for explanation of the matching range of the pulsecounter proper of the pure fluidic pulse counter shown in FIG. 7;

FIG. 11 is a diagrammatic view of one embodiment of the presentinvention for accomplishing the third and fourth objects thereof;

FIG. 12 is a graph for explanation of the effect of the element shown inFIG. 11;

' FIGS. 13 and 15 are diagrammatic views of the prior art outputamplifier elements;

FIGS. 14 and 16 show the waveforms for explanation of the modes ofoperation of the elements shown in FIGS. 13 and 15; 1

FIG. 17 is a fundamental circuit configuration for explanation of theoutput amplification method in accordance with the present invention;

FIG. 18 shows the waveforms for explanation of the mode of operation ofthe element shown in FIG. 17;

FIG. 19 shows the waveforms for explanation of the effect at a highfrequency of the element shown in FIG. 17;

FIG. 20 is a diagrammatic view of one embodiment of the presentinvention;

FIG. 21 shows the pressure waveforms for explanation of the elementshown in FIG. 20;

FIG. 22 is a graph for explanation of the effect of the outputamplification method in accordance with the present invention;

FIG. 23 is a circuit configuration when the output amplification methodin accordance with the present invention is applied to a feedback typepulse counter;

FIG. 24 is a circuit configuration when the present invention is appliedto one-shot multivibrator;

FIG. 25 shows the pressure waveforms for explanation of the mode ofoperation of the multivibrator shown in FIG. 24;

FIG. 26 is a circuit configuration when the present invention is appliedto an AND circuit;

FIG. 27 shows the pressure waveforms for explanation of the AND circuitshown in FIG. 26;

FIG. 28 is a circuit configuration of a shift register;

FIGS. 29, 30 and 31 are circuit configurations of oscillators;

FIG. 32 is a diagrammatic view for explanation of the prior art methodfor setting and resetting a pulse counter;

FIG. 33 is also a diagrammatic view illustrating the prior art methodfor setting and resetting a pure fluidic pulse counter;

FIG. 34 is a diagrammatic view for explanation of the principle of thepresent invention for accomplishing the seventh object thereof;

FIG. 35 is a graph for explanation of the mode of operation of theelement shown in FIG. 33;

FIG. 36 is a graph for explanation of the effect of the element shown inFIG. 34;

FIGS. 37 and 38 are also circuit configurations for accomplishing theseventh object of the present invention; and.

FIG. 39 is a circuit configuration in which the element or methodillustrated in FIG. 34 is applied to a pure fluidic pulse counter ofdifferent type.

Referring to FIG. 2, a pure fluidic pulse counter of the presentinvention for attaining the first object thereof will be described. Thepure fluidic pulse counter is characterized in that in addition to acirculation passage 3-5-5'-3 (to be referred to as the first circulationpassage") in communication with control ports of a flip-flop element 6for switching the output flow in a pure fluidic pulse counter shown inFIG. 1, there is provided at least one pair of second circulationpassages 7 and 7'. The second circulation passages 7 and 7 are branchedfrom two output flow passages 2 and 2' of the flip-flop element 6respectively and joined to the first circulation passage at 5 and 5respectively. That is, the second circulation passages are designated by5-7 and 7'-5' respectively. The fluid flowing through these secondcirculation passages is fed back to the output flow passage of an inputsignal pulse branching element. Therefore, when the output flow isemerging from the output port 2, the liquid flows in the directionsindicated by the solid arrows at 5 and 5'. However, when the input pulseis applied through an input port 4, it is diverted in the directionsindicated by the broken arrows and a portion of it reaches a controlport 3 of a flip-flop element for switching the output flow. The inputpulse 4 is sufficient enough to switch the output flow to the oppositeside, and the switched output fiow 2 is discharged through an outputport 2' and is stabilized. Thereafter, the output flow is stablydischarged even when no input pulse 4 is applied and the liquid iscirculated in the directions opposite to those indicated by the arrowsin FIG. 2. That is, the condition is reversed. When the next input pulseis applied, the output flow is switched in a similar manner so that thepulse counter is returned to its initial state. Thus the pulse counterreverses its state from one to the other, whereby the input pulses maybe counted.

According to the present invention, the input pulse is positively andrapidly diverted by both of the control flow and the second circulationflow and the switching of the output fiow by the flip-flop element 6 inresponse to the input pulse is also effected at both of the control portand the diverting point of the second circulation passage. Therefore,the switching operation may be stabilized and switching time may beminimized, whereby the function and reliability of the fluidic pulsecounter may be much enhanced.

Furthermore, the load resistance of the input pulse branching element isreduced so that the matching range of the two elements is increased. Asa consequence the reproducibility is much increased while the range ofvariability of manufactured elements is much minimized as compared withthe prior elements.

The advantageous feature of the second circulation passages will becomemore apparent when reference is made to FIG. 3 in which the upperwaveforms are the output pulses P0 while the lower waveforms, the inputpulses Pi. It is seen that when the second circulation passages areprovided in the prior art element which cannot count as shown on theleft in FIG. 3, the maching range between two elements is much increasedwhereby counting may be accomplished easily.

As described hereinbefore, in the improved fluidic pulse counter shownin FIG. 2, the direction of the input pulse is determined by both of thefirst and second circulating flows so that the input pulse is rapidlyand securely directed, thus eliminating the crratic operation. Inaddition, the circulating flow is compensated to some extent by thesecond circulating flow so that the design of the control nozzles of theflip-flop element 6 and its adjacent portions may be mainly directedtoward the attainment of the smooth and positive switchingcharacteristics. Thus, the matching of the flip-flop element 6 may beeasily attained. Therefore, as compared with the prior art element shownin FIG. 1, the fluidic pulse counter of the present invention is easy todesign and less in the range of quality variability, but its function isnot satisfactorily improved over the prior art element.

SECOND EMBODIMENT The second embodiment of the present invention has forits object to greatly improve the function of the fluidic pulse countershown in FIG. 2 as will become apparent from the following description.

In both of the fluidic pulse counters shown in FIGS. 1 and 2, thecirculation flow is provided by the negative pressure produced bydrawing of the output flow. That is, only when low-pressure eddy flows 9and are formed under effect as shown in FIG. 4, the circulation flow isproduced. Thus there develops some time lags and the maximum countfrequency is limited.

To overcome this problem, the present invention contemplates to providethe positive generation of the circulating flow. The feature of thesecond embodiment of the present invention resides in the fact that, asshown in FIG. 5, the third circulation passage Ill is formed through amain jet divider 8 so that at least one portion of the output flow 2 or2' may be branched into the third circulation passage 11. That is, whenfluid is flowing through the right output flow passage 2 as shown inFIG. 5, the fluid also flows into the third circulation passage ill inthe direction indicated by the arrow and thereafter into a left controlnozzle 3' and left nozzle 7' in the second circulation passage 2',whereby the positive pressure flow is produced. Therefore in the fluidicpulse counter of the present invention, the circulation flow isgenerated positively not only by the drawing by the output flow at thesecond circulation passage 7 or 7' and a control nozzle 3 or 3' but alsoby the positive pressure flow flowing into the control nozzle 3' or 3and the second circulation passage 7' or 7 from the third circulationpassage 11. As a consequence, the quantity of circulation flow isincreased, and the circulation flow velocity is also increased so thatthe positive and rapid distribution or divergence of the input pulse maybe ensured.

The circulation passage pattern shown in FIG. 6 is a variation of thefundamental circulation passage pattern shown in FIG. 5. That is, anland 12 which is shown in FIG. 6 as having a horse-shoe shape (inpractice it is not limited to this shape) and constituting one of thewalls of the third circulation passage 11 is eliminated. The positiveformation of the third circulation flow in the circulation passagepattern in FIG. 6 is also ensured so that the same effect as that of thepattern shown in FIG. 5 may be attained. Furthermore, the passagepattern shown in FIG. 6 is simpler than that shown in FIG. 5 so that themanufacture of the pulse counters may be much facilitated.

Next referring to FIG. 7, the mode of operation of the fluidic pulsecounter in accordance with the present invention will be described.Working fluid enters into the main jet nozzle 1 and is directed intoeither of the right of left output passage 2 or 2'. The fluid flow inthe passage 2 or 2' is stable as far as no signal flow emerges throughthe control nozzle 3 or 3'. When the working fluid is flowing throughthe right output passage 2, the negative pressure flow is produced dueto the drawing or suction by the output flow. In the right control nozzle 3 and the right second circulation passage 7, fluids flow asindicated by 3 and 7, and previously or simultaneously at least oneportion of the output flow 2 is divided by one of the main jet divider13 to form the third circulation flow II, at least some portion oralmost all of which flows into both or either of the left control port3' and the left second circulation passage 7', thereby forming thepositive pressure flow 3' and 7' as shown in FIG. 7. Thereafter theymeet in the passage 5 to form the circulation flow 5'5 in the passages5'-5.

Now when the input pulse 4 is applied through the input pulse port 4, itis diverted toward the direction of the circulation flow. When it flowsout of the control nozzle 3, working fluid flow 2 is switched to flowfrom the right output passage 2 into the left output passage 2 and isstabilized. (See broad dotted line 2'). That is, the flows are reversedfrom those shown in FIG. 7. When the next input pulse is applied, theinput pulse flow 4 flows out of the control nozzle 3' and the workingliquid flow 2' is switched. Thus, the pulse counter is returned to itsinitial state. It is seen that binary counting of input pulses is madewhen the operations described above are repeated.

According to the present invention, the circulating flow which divertsthe input pulse flow is generated not only by the negative pressure flowwhich has been also used in the prior art but also the positive pressureflow due to the third circulation flow, so that the circulation flowrate may be increased while the input pulse flow may be positivelydirected. In addition time lag in the process of formation of thecirculating flow is remarkably minimized whereby counting at highfrequency becomes possible. Thus the function of the pulse counter isremarkably improved as shown in FIG. 8 in which the diameter inmilimeter of the orifice of the load of the counter is plotted againstthe abscissa while the circulation flow rate against the ordinate. Whenthe working fluid (air) under the pressure of 0.1 kg/cm is made to flowthrough the main nozzle 1. It is seen that the flow rate is muchincreased than that of the fluidic pulse counter shown in FIG. 2 andthat whereas the circulation flow in the pulse counter shown in FIG. 2is generated only by the negative pressure flow, the circulation flow inthe pulse counter shown in FIG. 7 is mainly generated by the positivepressure flow so that the positive formation of the circulation flow isenhanced and the time required for forming the circulation flow is muchminimized.

FIG. 9 is a graph giving the maximum count frequencies of the threepulse counters described hereinabove. In the experiments the workingfluid (air) under the pressure of 0.3 kg/cm was made to flow through themain nozzle, and the input pulses were so adjusted that the number ofpulses counted became highest. In the pulse counter in accordance withthe present invention, the input pulses were made constant over thewhole range so that it is expected that the number of pulses to becounted may be much increased. From FIG. 9, it is seen that the functionof the fluidic pulse counter in accordance with the present invention isremarkably increased.

When a number of pulse counters are connected in series in fan-out 1 ormore or when they are connected to other fluidic elements or the like asthe loads of pulse counters, the latter are not actuated when the outputpressure or fiow rate of the pulse counters are not sufficient enough tomeet the minimum allowable value of the input level of the fluidiccontrol elements or the like connected. In some cases, erratic operationwill occur. Not only the pure fluidic pulse counterof the type shown inFIG. 1 but also the fluidic pulse counters of the present invention ofthe type shown in FIGS. 2 and 7 have this problem as will become moreapparent from the following description by reference to FIG. 10.

In FIG. 10 the characteristics of the pure fluidic pulse counter of thetype shown in FIG. 7 are illustrated. In the first quadrant the relationbetween the diameter of the orifice of the load connected to thebistable pure fluidic element and the output pressure Po and theswitching control pressure swPc required for switching the workingfluid. The length of .the orilice is constant (7 mm). In the secondquadrant, the relation between the input signal pressure Pi and thepressure P of the working fluid when it flows into the control nozzle ofthe bistable fluidic control element is shown. When the pure fluidicpulse counters are connected in series in fant-out l, the matching rangeis very much limited as shown in FIG. 10. It is seen that the inputsignal pressure Pi from the preceding pulse counter is about 32 percentof the supplied pressure Ps from the output pressure curve of thefan-out 1 bistable pure fluidic elements shown in the first quadrant. Inthis case, fan-out 1 corresponds to the diameter hr of 0.8 mm, and theprocess for obtaining the input signal pressure Pi is indicated by thearrow From the switching control pressure curve swPc of the bistablepure fluidic element, it is seen that the minimum input signal pressurePi of the counter is about 25 percent of the supplied pressure Ps.Therefore the matching range of the pure fluidic pulse counters infan-out l is only 7 percent of the input signal and only 2.5 percentwhen converted into the control signal pressure of the bistable purefluidic element. The process of obtaining these values is indicated bythe arrows in FIG. 1.

It is considered that the above narrow matching range might be withinthe product variation, so that the yield of products would become worse.Furthermore, even when the characteristics of the pure fluidic pulsecounter are slightly changed due to the accumulation of foreign mattersand aging, the next pulse counter will fail to function. That is thepure fluidic pulse counters of the type described hereinabove are stillunreliable and undependable in operation.

The fluidic pulse counter which accomplishes the third and fourthobjects of the present invention is diagrammatically shown in FIG. 11. Apure fluidic flipflop element 15 is cascaded to a pure fluidic pulsecounter proper 14 which has the characteristics described above toconstitute a pure fluidic pulse counter 16. The characteristics of thepure fluidic pulse counter 16 are illustrated in FIG. 12, and thematching range may be obtained from these diagrams. That is, the FIG.12-a shows the characteristics of the pure fluidic pulse counter propershown in FIG. 10 while the FIG. 12-b shows the relation among the outputpressure Po, the switching control pressure swPc and the suppliedpressure P' s (FIG. 1 l, l) of the pure fluidic pulse counter connectedto a load in fan-out l.

The range A in FIG. 12-a indicates the matching range of the purefluidic pulse counter proper 15 connected in series in fan-out 1 whilethe range B, the matching range enlarged by the connection of the purefluidic flip-flop element 15. When the pure fluidic flipflop element isconnected to the pure fluidic pulse counter proper, the above bistablepure fluidic element is connected to a load with br= 0.08 mm in diameterso that from FIG. l2-a it is seen that the switching control pressureswPc is 12 percent of the supplied pressure Ps and the output pressureP0 is 27 percent. Therefore the minimum input pressure is 23 percent.The minimum supply pressure min P's (0.65 Ps) required for operating thenext pulse counter is obtained by drawing the straight line from theintersection where Pi Fe in parallel with the abscissa. The intersectionbetween this straight line and the output curve of the pure fluidicflip-flop element 15 indicates the minimum supply pressure min P's. Nextthe intersection between the switching control pressure of the fluidicflip-flop and the output pressure curve of the bistable pure fluidicelement when the orifice of the load hr 0.8 mm in diameter (theresistance of the control nozzle of the pure fluidic flip-flop element)which curve is displaced in parallel with the abscissa, is obtained toobtain the maximum supply pressure max P's required for the pure fluidicflip-flop element to cause the fluid to flow precisely through the purefluidic pulse counter proper. The maximum supply pressure maxPs' is 1.8Ps in FIG. 12. Therefore, the pure fluidic pulse counter may be matchedeven when connected in series in fan-out 1 when the supply pressure P'sof the fluidic flip-flop element is within the range (0.65-1.8 Ps)obtained in the manner described above when the supply pressure Ps

1. A fluidic pulse counter characterized in that a bistable element ofthe type in which a jet from a main jet source is alternately switchedto flow either of two output flow passages by control flows which arealternately discharged out of two control ports disposed in oppositerelation with said main jet source, is provided with a first circulationpassage having an input pulse source in communication with said twocontrol ports of said element, and at least one second circulationpassage connecting said input pulse source with one point of each ofsaid two output flow passages whereby the input signal flow may bepositively and quickly diverted into a desired direction.
 1. A fluidicpulse counter characterized in that a bistable element of the type inwhich a jet from a main jet source is alternately switched to floweither of two output flow passages by control flows which arealternately discharged out of two control ports disposed in oppositerelation with said main jet source, is provided with a first circulationpassage having an input pulse source in communication with said twocontrol ports of said element, and at least one second circulationpassage connecting said input pulse source with one point of each ofsaid two output flow passages whereby the input signal flow may bepositively and quickly diverted into a desired direction.
 2. A fluidicpulse counter as set forth in Claim 1 wherein at least one input port ofat least one pure fluidic element having an excellent response and anamplification function is coupled to at least one output port of saidpulse counter thereby increasing the match-ing range for connection witha fluidic element or device in the next succeeding stage and stabilizingthe operation of said pulse counter.
 3. A fluidic pulse counter as setforth in claim 1 wherein third circulation passage is formed in theproximity of a main jet diverting edge so as to pass therethrough atleast one portion of said main jet to form the positive pressure flow orflows in either of said first or second circulation passage opposite tosaid output flow passages or in both of said first and secondcirculation passages thereby positively forming said first and secondcirculation flows.
 4. A fluidic pulse counter as set forth in claim 3wherein at least one input port of at least one pure fluidic elementhaving an excellent response and amplification function is connected toat least one output port of said fluidic pulse counter therebyincreasing the matching range for connection with a fluidic element ordevice in the next stage and stabilizing the operation of said fluidicpulse counter.
 5. A fluidic pulse counter as set forth in cLaim 3wherein at least one right and left input ports of an monostable elementhaving a forced-reverse control nozzle are connected to at least oneright and left output ports of said fluidic pulse counter therebyensuring the output amplification of said fluidic pulse counter at ahigh frequency.
 6. A fluidic pulse counter as set forth in claim 5wherein at least one throttle is inserted in said forced-reverse controlnozzle of said monostable element or in the connecting tube or passagein communication therewith, thereby permitting the matching adjustmentbetween said pulse counter proper and a monostable element to beconnected thereto.
 7. A fluidic pulse counter as set forth in claim 3wherein said fluidic pulse counter further includes at least one set orreset nozzle for switching said output slow and at least one set orreset nozzle for switching the input signal flow emerging from saidinput pulse source; said set nozzles for switching said output and inputsignal flows are connected to each other with a connecting tube orpassage while said reset nozzles for switching said output and inputsignal flows are also connected to each other with a connecting tube orpassage; and said fluidic pulse counter is set or reset by a switchingsignal transmitted through either of said two connected system.
 8. Afluidic pulse counter as set forth in claim 7 wherein throttles areinserted in said set or reset nozzles for switching said output andinput signal flows or in the connecting tubes or passages incommunication therewith thereby permitting the adjustment of the set orreset operation of said fluidic pulse counter.
 9. A fluidic pulsecounter as set forth in claim 1 wherein at least one right and leftinput ports of a monostable element having a forced-reverse controlnozzle are connected to at least right and left output ports of saidpulse counter thereby ensuring the positive output amplification of saidfluidic pulse counter at a high frequency.
 10. A fluidic pulse counteras set forth in claim 9 wherein at least one throttle is inserted insaid forced-reverse control nozzle of said monostable element or aconnecting tube or passage in communication therewith thereby permittingthe matching adjustment between the pulse counter proper and amonostable element to be connected to said pulse counter.
 11. A fluidicpulse counter as set forth in claim 1 wherein said fluidic pulse counterfurther includes at least one set or reset nozzle for switching theoutput flow and at least one set or reset nozzle for switching the inputsignal flow emerging from said input pulse source; said set nozzles forswitching said output and input signal flows are connected with eachother with a connecting tube or passage while said reset nozzles forswitching said output and input signal flows are connected with eachother with a connecting tube or passage; and said fluidic pulse counteris set or reset by a switching signal transmitted through either of saidtwo connected system.